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Power Strokes
7.3 Tech
4x4 engages defrost
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[QUOTE="sirnunya, post: 399425, member: 3359"] may want to check vacuum pump and all lines. defrost is default position with no vacuum. engaging 4x4 is using vacuum, causing vents to default. Thats also why he can't get it back out of 4x4. I was stuck in 4x4 with a/c blowing thru defrost, tapped vacuum pump connection with wrench and it started pumping. Was finally able to get it out of 4wd [/QUOTE]
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4x4 engages defrost
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